Vehicle Path Control During Autonomous Braking
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Solution Overview
Problem
During autonomous braking events, the actual vehicle travel path may diverge from the driver's intended path, leading to a need for a system that adjusts braking to maintain alignment with the driver's intended path.
Innovation Solution
A motor vehicle travel path control system that evaluates inputs from the vehicle and collision preparation system, adjusting braking to align the actual path with the driver's intended path by implementing a rapid sequence of brake reduction commands and increments, ensuring the vehicle stays on course.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If autonomous braking is applied during collision preparation, then deceleration performance is improved, but vehicle path control deteriorates causing deviation from driver's intended path
Solution Approach 1:
The system continuously monitors the actual vehicle path using sensors (steering wheel angle sensor, lateral acceleration sensor, yaw sensor, wheel speed sensors) and compares it with the driver's intended path. Based on this feedback, the controller dynamically adjusts brake pressure distribution to correct path deviations while maintaining deceleration performance.
Solution Approach 2:
The controller changes brake pressure parameters dynamically during autonomous braking. It adjusts the magnitude and distribution of brake force on individual wheels based on real-time path deviation measurements, steering input, and vehicle dynamics data to maintain path alignment while achieving collision avoidance deceleration.
2Reliability
If brake pressure is increased for autonomous emergency braking, then collision avoidance capability is improved, but vehicle stability deteriorates due to understeer or oversteer
Solution Approach 1:
Instead of applying brake pressure uniformly to all wheels, the system applies localized brake force to specific wheels based on real-time vehicle dynamics. The controller individually adjusts brake pressure on front and rear wheels, and left and right wheels, to maintain optimal traction and prevent understeer or oversteer while achieving emergency deceleration.
Solution Approach 2:
The brake pressure distribution is dynamically adjusted during autonomous braking based on changing vehicle conditions. The system continuously modifies brake force magnitude and distribution in response to steering input, lateral acceleration, yaw rate, and wheel speed variations to maintain vehicle stability throughout the braking event.
3Measurement precision
If ESC sensors continuously monitor vehicle state, then vehicle control precision is improved, but system complexity increases
Solution Approach 1:
The ESC sensor system serves multiple functions: it monitors vehicle state for stability control, provides data for autonomous braking path control, and detects driver intent through steering wheel angle. By making the sensor system multi-functional, the patent avoids adding separate sensors for autonomous braking while achieving precise vehicle state measurement.
Data Source
AI summary
A motor vehicle travel path control which monitors, during an autonomous braking event initiated by a collision preparation system the actual motor vehicle travel path in relation to the driver intended motor vehicle travel path, and in the event a departure from the driver intended motor vehicle path occurs, the motor vehicle travel path control adjusts braking so as to return the motor vehicle travel path to that intended by the driver.